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Abridged... Blue stragglers (BSS) are thought to be the product of eitherprimordial or collisional binary systems. In the context of dwarf spheroidalgalaxies it is hard to firmly disentangle a genuine BSS population from youngmain sequence (MS) stars tracing a ~1-2 Gyr old star forming episode. Assumingthat their blue plume populations are made of BSS, we estimate the BSSfrequency for 8 Local Group non star-forming dwarf galaxies, using acompilation of ground and space based photometry.  Our results can be summarized as follows: (i) The BSS frequency in dwarfgalaxies, at any given Mv, is always higher than that in globular clusters ofsimilar luminosities; (ii) the BSS frequency for the lowest luminosity dwarfgalaxies is in excellent agreement with that observed in the Milky Way halo;and most interestingly (iii) derive a statistically significantanti-correlation between the BSS frequency and the galaxy Mv.  The low density, almost collision-less, environments of our dwarf galaxysample allow us to infer (i) their very low dynamical evolution; (ii) anegligible production of collisional BSS; and consequently (iii) that theirblue plumes are mainly made of primordial binaries. The dwarf galaxiesanti-correlation can be used as a discriminator: galaxies obeying theanti-correlation are more likely to possess genuine primordial BSS rather thanyoung main sequence stars.

The blue plume population in dwarf spheroidal galaxies: genuine blue stragglers or young stellar population?